\perpThe symbol \perp is used to denote perpendicularity in geometry. It indicates that two lines, segments, or vectors are perpendicular to each other, meaning they intersect at a right angle (90 degrees).
Line AB is perpendicular to line CD.
AB \perp CDVector u is perpendicular to vector v.
\vec{u} \perp \vec{v}The gradient of function f is perpendicular to the gradient of function g.
\nabla f \perp \nabla g